1.This movie is a watered down version of the famous book.
这部电影是那本名著的删减版。
water down:
(idiomatic) To simplify or oversimplify; to make easier; to make less difficult.
2.The action movie looks like it's nothing but eye candy.
动作片像是华而不实的东西。
Most of the images on the website are not more than eye candy.
网页上大多数图片虽然吸引眼球，却毫无意义。
eye candy:
(US, idiomatic) Any object or sight with considerable visual appeal.
3.The critics damned the new film with faint praise although it's really popular recently.
虽然这部电影最近广受欢迎，评论家们却明褒实贬。
damn with faint praise:
(idiomatic) To provide praise that is minimal or inconsequential, implying that such praise is the best that could be said.
